Backend Engineer III
Fulfillmentiq
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Benefits offered by this job
Job summary
Fulfillment IQ is seeking a Backend Engineer III to build the core services, data models, and APIs powering a new greenfield platform at the heart of our supply chain technology. You will own production-grade backend logic, focusing on data integrity, correctness, and performance, collaborating with the founding engineer and full-stack team.
In this role you will design services and schemas, implement workflows, and help scale the architecture while maintaining high quality and fast delivery.
Qualifications
- 4–6 years of experience building backend services and APIs.
- Strong Python fluency; production Python from day one.
- Experience designing REST APIs with FastAPI, Flask, or Django.
- Strong relational DB skills, schema design, SQL (PostgreSQL or similar).
- Experience with ORMs and data modeling.
- Translate requirements into robust, production-ready backend systems.
- Strong fundamentals in performance, reliability, and maintainability.
- Comfort in a fast-moving, early-stage environment with high ownership.
Responsibilities
- Design and build backend services, APIs, and data models.
- Implement business logic and processing workflows.
- Design relational schemas and manage database migrations.
- Ensure data integrity, correctness, and API performance.
- Write tests and contribute to engineering standards.
- Integrate with external systems and data sources.
- Collaborate with full-stack engineers, product, and the platform’s technical owner.
- Participate in code review and technical design.
- Help evolve the backend architecture as the platform scales.
Skills
Tools
Job description
General Information:
Job Title: Backend Engineer III
Location: Toronto (Onsite/Hybrid)
Job Type: Full-Time
Hiring Timeline: Immediate
Reporting Line: Head of R&D
Existing Vacancy: Yes
Application Deadline: Open until Filled
Salary Range: $105-125K CAD per year (negotiable)
About Fulfillment IQ (FIQ):
Fulfillment IQ is a supply chain engineering and transformation company that helps brands, retailers, and 3PLs design, build, and scale high‑performing logistics operations.
We work at the intersection of strategy, operations, and technology where we solve complex, real‑world problems across warehouse design, automation, order management, transportation, and end‑to‑end supply chain execution.
Our teams combine deep domain expertise with strong technical capability, delivering outcomes through consulting, systems implementation, and proprietary platforms that accelerate time‑to‑value and reduce delivery risk.
If you enjoy working in complex environments, partnering closely with clients, and seeing your work make a tangible impact on how global commerce moves, this is the place where your skills and judgment truly come to life.
As a Backend Engineer III, you will build the services, data models, and APIs that power a new greenfield platform at the core of FIQ’s supply chain technology. You will write the business logic and processing workflows that everything else depends on, with a focus on data integrity, correctness, and performance. Working alongside the founding engineer and full‑stack team, your work will form the reliable backbone the rest of the product is built on.
- Design and build backend services, APIs, and data models
- Implement business logic and processing workflows
- Design relational schemas and manage database migrations
- Ensure data integrity, correctness, and API performance
- Write tests and contribute to shared engineering standards
- Integrate with external systems and data sources
- Collaborate closely with full‑stack engineers, product, and the platform’s technical owner
- Participate in code review and technical design
- Help evolve the backend architecture as the platform scales
- 4–6 years of experience building backend services and APIs
- Strong, hands‑on Python fluency; you will write production Python from day one
- Experience designing and building REST APIs, ideally with FastAPI, Flask, or Django
- Strong relational database skills, including schema design and SQL (PostgreSQL or similar)
- Experience with ORMs and data modeling
- Ability to translate requirements into robust, production‑ready backend systems
- Strong engineering fundamentals across performance, reliability, and maintainability
- Comfort operating in a fast‑moving, early‑stage environment with high ownership
- Experience with AI‑driven development and AI‑assisted engineering workflows
- Experience with LLM‑integrated development, including RAG and retrieval‑augmented patterns
- Experience with FastAPI, SQLAlchemy, and Alembic
- Experience with multi‑tenant systems or complex data models
- Experience building workflow engines, pipelines, or DAG‑based processing
- Familiarity with CI/CD, containers (Docker), and cloud infrastructure
- Experience with calculation engines, rules engines, or deterministic data pipelines
- Exposure to logistics, supply chain, fintech, or data‑intensive SaaS platforms
- Ramp up on the codebase, data model, and product domain
- Set up local development and deployment environments
- Ship your first backend changes and endpoints
- Build working relationships across the team
- Take ownership of a backend service or feature area
- Deliver production‑grade APIs and data models
- Contribute to backend standards and shared patterns
- Actively participate in technical design and code review
- Independently own backend features from design through production
- Improve reliability, performance, and data integrity across services
- Demonstrate consistent, measurable delivery velocity
- Help raise the engineering quality bar for the growing team
- Consistent delivery of production‑ready backend services and APIs
- Data integrity and correctness across the system
- API performance and reliability
- Code quality and test coverage
- Velocity and throughput of shipped backend work
At Fulfillment IQ, we don’t just build supply chain solutions. We build careers, friendships, and unforgettable experiences. We believe in giving our senior technical leaders real ownership, real influence, and the opportunity to shape platforms that power real‑world logistics operations.
Here’s what makes working with us a rewarding experience:
Build systems that directly impact global commerce and supply chain performance.
We invest in mentorship, leadership development, learning budgets, and long‑term career growth.
We support remote and hybrid work models by offering multiple office locations to help you perform at your best.
From team wins to work anniversaries, we recognize impact, celebrate milestones and reward performance.
Work alongside talented engineers, product leaders, and award‑winning domain experts who value ownership, transparency, and high standards.
- Employee Health: Comprehensive health and dental coverage for you and your family
- Time Off: Competitive paid time off and flexible leave policies
- Retirement: Retirement savings programs and employer contributions
- Professional Growth: Dedicated learning and development budget
- Flexible Work: Remote and hybrid work options
- Perks: Equipment allowances, internet reimbursements, business travel coverage, and employee stock options (ESOP), where applicable.
- Community Engagement: Team events, meetups, and company offsites
Fulfillment IQ is a people‑first company built in trust, collaboration, and ownership. We are proud to be an equal opportunity employer and are committed to building a diverse, inclusive, and high‑performing workplace.
FIQ uses artificial intelligence to assist in the screening, assessment, and shortlisting of applications for this position, including features within our applicant tracking system. AI supports human reviewers and does not make hiring decisions on its own. Final hiring decisions are made by FIQ personnel. If you have questions about how AI is used in this process, contact hr@fulfillmentiq.com.
FIQ is committed to an inclusive and accessible recruitment process. Accommodations are available on request at any stage of recruitment and assessment. Contact hr@fulfillmentiq.com and we will work with you to meet your needs.
Your personal information is collected and used for recruitment purposes in accordance with FIQ’s Candidate Privacy Notice. This includes the use of AI‑assisted screening described above and storage that may occur in the United States. By applying, you acknowledge this notice. Questions: hr@fulfillmentiq.com.
Fulfillment IQ is a people‑first company built on trust, collaboration, and ownership. We are proud to be an equal opportunity employer and are committed to building a diverse, inclusive, and high‑performing workplace.
Website: fulfillmentiq.com
LinkedIn: Fulfillment IQ
Spotify: eCom Logistics Podcast Spotify
YouTube: eCom Logistics Podcast YouTube
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